And joseph w



2 Shets-Sheet 1.

(No Model.)

W.v H. WHITE & J. W. CHAMBERLAIN.

STEAM GENERATOR.

Inventor.

(No Model.) 2 SheetsSheet 2. W. H. WHITE 82: J. W. CHAMBERLAIN.

. STEAM GENERATOR. I No. 375,033. Patented Dec. 20,1887.

wi Lmwoeo y QM 8 I UNITED STATES PATENT OFFICE.

WILLIAM H. \VHITE, OF BOSTON, MASSACHUSETTS, AND JOSEPH W. CHAM- BERLAIN, OF BANGOR, MAINE, ASSIGNORS TO J. V. CHAMBERLAIN &

00., OF BANGOR, MAINE.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 375,033, dated December 20, 1887.

Application filed April 21, 1887. Serial No. 235,595. (No model.)

To all whom it may concern.-

Be it known that we, WILLIAM H. WHITE, of Boston, in the county of Suffolk and State of Massachusetts, and J osEPH W. CHAMBER 5 LAIN, of Bangor, in the county of Penobscot and State of Maine, citizens of the United States, have invented a new and useful Improvement in SteanrGenerators'; and We do hereby declare that the following is a full,

[ clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

Our improvement relates to that kind of I steam-generators in which the water is confined in a number of separate coils of wroughtiron pipes arranged in such a manner (one coil above another) as to form a circular firebox, through which the fire and unconsnmed gases have free access around each distinct pipe, the ends of each coil being separately connected with a steam-dome in such a manner that each coil holding only a few quarts of water rapidly converts its contents into steam, which readily and without having to force its way through a mass of cold water rises, filling the dome or steam-chamber, forces the cold water at the bottom of said dome through a return pipe or pipes that connect with the 0 lower end of each coil, and becomes distributed through the separate coils, which, being heated, quickly convert the cold water into steam, ascending as before, thereby keeping up a constant circulation through theheatingchamber and generating a large amount of steam in a very short time with a small amount of fuel, as illustrated in the accompanying drawings, of which- Figurel is a vertical section of the complete 0 generator. Fig. 2 is an elevation of a separate coil, showing its connection with the returnpipe. Fig. 3 is a plan of the generator with the dome rehioved. Fig- 4 is a plan of dome with one-half, of top removed, showing the coil-connections through the bottom and part of fuel-door.

Similar letters refer to corresponding parts throughout the several figures.

The object of our invention is to provide a 5:: steam-generator by which water may be heated or converted into steam in a short space of time with a small amount of fuel. In order to accomplish this we use an ash box or pit, A, (shown in Fig. 1,) provided with a door and draft-gate, B, and a grate-frame, 0, having a raised rim, D, upon its inneredge, that serves as a support or rest for the bottom coil, G. Resting upon the raised rim D, a series of coils of wroughtiron pipes, G, is placed one directly above the other, but not connecting with each other. The upper end,K, of each separate coil G extends in a vertical direction through the bottom of the steam-dome J to a point reaching just above the water-line in said dome. Within these coils of pipe G is another series of wrought-iron-pipe coils, H, arranged substantially in the same manner, having the upper end, K, of each coil H extending through the bottom of the steam-dome J to a point j ust above the water-line. The lower end of each and every coil G H is connected with one or more somewhat larger vertical pipes L L in Figs. 1 and 3, whose upper end passes just through the bottom of steam-dome J. The lower ends of said vertical pipes L L extend down between the outer and inner coils, G H, until they reach a convenient point near the bottom of the fire-box N, there connecting into one pass through the outside casings, X Y Z, and become a pipe to which the return-pipes from all the radiators or other outside steamheating devices are connected.

Just above the grate F and directly within the fire are four horizontal wrought -iron pipes, M M, Fig. 3, connecting in a cross-head at the center of the fire-box N, two ends of the cross-head M connecting with the lower ends of the vertical pipes L L. The other two ends pass across the fire-box N, turn at right angles, and extend upward-one each side of the firebox door b-between the outer and inner coils, G H, through the bottom of steam-dome J to a pointjust above the water-line, as shown in Fig. 1. The object of said cross-head pipes M M is principally to increase the heatingsurface within the fire box, being entirely within the fire; but they also serve to assist the grate F, when shaken in clearing the fire of ashes, by holding the mass of coal above them nearly stationary.

The inner coils, H, and thelower outer coils of wrought-iron pipes, G, form a magazine or fire-box to hold the coal or other material that may be used for fuel during theprocess of combustion.

The annular-shaped hot-water reservoir or steam-dome J is held directly above the coils of wrought-iron pipes by means of iron rods 00', screwed into the grate-frame 0, their upper ends being bolted securely to dome J. This dome is constructed in this peculiar shape in order that there may be a large opening, I, as shown in Figs. 1 and 4., provided with a door or cover, '0, through which the fuel passes into the fire-box N, filling up the inside of the coils H and the bottom coils, G, by this arrangement forming a magazine which allows the fire to be constantly supplied with fuel without the necessity of an attendant, as one filling will last for days, the fuel falling by its own weight as fast as it is consumed by the process of combustion, the fire being readily watched at any time by means of the small door I), and regulated by dampers, as arranged in an ordinary stove, or by any self-regulating devices that may be desired. v

The inner sheet'iron case, Y, rests upon the grate-frame O and extends upward to the outer bottom edge of the steam-dome J, and is lined on its inner side with asbestus cement felting, X, having holes i near itsupper edge for the escape of smoke and the unconsumed gases of combustion, which pass through these apertures downward between the inner and outer casings, Y Z, and finally escape by means of the funnel r at the bottom of the outer casing, which connects with a chimney. There is also an aperture for a small door, 1), opening into the fire-box N, the frame of said door being tightly bolted to the two casings Y Z connecting them. Said casing closely incloses the fire-box coils, forming the outer walls of the firebox.

The outer sheet-iron case, Z, is secured to the grate-frame O and extends upward as far as the top of the steamdome J, tightly inclosing the latter by being made in a conical shape above the line of the bottom of dome J, completely inclosing the inner case, Y, but leaving a space between them sufficient to allow the smoke and unconsumcd gases of combustion from the fire-box to pass down all around the inner case, Y, and out through an aperture near the bottom of said outer case, Z, into the smoke-pipe 'r. with a small door, 1), (shown in Figs. 1 and 3,) opening into the fire-box N, the frame of said door I) being tightly bolted to the two casings Y and Z.

Having thus described our invention, what we claim, and desire to secure by Letters Pat- Gilt, lS-v 1. A steam-generator composed of two or more separate coils of heating-pipes, G and H, in combination with a grate and a steam-dome, the upper end, K, of each coil connecting separately with the steam-dome J, and extending through the bottom thereof and above the wa- This outer case is provided ter-line, one or more return-pipes, L, connectingthe lower ends of each separate water-coil, extending vertically inside the outer heatingcoils, G, and through the bottom of the steamdome J, all situated within an outer casing, substantially as described.

2. In asteam-generator, a fire-box composed of a series of short independent coils of heatingpipes, G, arranged one above the other and above the fire, the upper end, K, of each coil extending through the bottom of the steam-dome J and above the water-line, their lower ends connecting with one or more re: turn-pipes, L, from the steam-dome, all entirely inclosed by the outer casings, Y and Z, substantially as described.

3. In a steam-generator, a steam-dome, J, connected with one or more series of short separate coils of heatingpipes, their upper ends, K, extending through the bottom of the steam-dome J and above the water-line, and their lower ends connected with one or more return-pipes, L, from said dome, extending between the outer and inner series of heatingcoils, G and H, in combination with a firebox composed of short coils of heating-pipes G, arranged one directly above the other, their upper ends connecting independently with the steam-dome J and their lower ends with the return-pipes L from said dome, all situated inside an outer casing connected with a tiregrate, substantially as described.

4. A steamgenerator composed of short separate coils of heating-pipes, G and H, each coil connected independently with a steamdome directly over them, in combination with cross-pipes M M, adapted to serve as a grate, one end of each cross-pipe extending through the bottom of the steam-dome J and above the water-line, the other end connected with return-pipes from said steam dome, all inclo'sed by one or more casings, substantially as described.

5. In a steam-generator, a steam'dome, J, having a passage or opening, I, through it, in combination with one or more series of short separate heating-coils, G and H, the upper end of each coil extending through the bottom of the annular-shaped steam-dome J and above the water-line, and their lower ends connected with one or more return-pipes, L, from the steam-dome J, the inner series of coils of heating pipes H, arranged directly under the opening I in the steam-dome J, together with a fire-box composed of a series of short coils of heating-pipes, G, connectedseparately with the steam-dome J, arranged with a grate, F, forming a magazine or self-feeding heater, substantially as described.

6. The combination of two or more series of short separate watercoils, G and H, their upper ends, K, extending through the bottom of the annular-shaped steam-dome J and above the water line, their lower ends connecting with one or more vertical return-pipes, L, connected with the steam-dome J, the cross- ICO IIO

pipes M M, adapted to serve as a grate, their a grate, F, and ash-pit A, all substantially as ends connected with the return-pipes L and described. opposite vertical pipes 70, extending through WM. H. WHITE. the bottom of the steam-dome J and above the JOSEPH W. CHAMBERLAIN. 5 water-line, the annular-shaped steam-dome Witnesses:

J, with the passage or opening I through it, l P. W. J. LANDER, the inner casing, Y, the outer casing, Z, with I HARRY D. STEWART. 

